Md. Code, Tax - General § 12–305

(a) Unless otherwise authorized under this title, a person may not possess, sell, or attempt to sell unstamped cigarettes in the State.

(b) A person may not make, cause to be made, or procure an altered or counterfeited tax stamp.

(c) A person may not knowingly or willfully use, transfer, or possess an altered or counterfeited tax stamp.